Buy a quart first instead of a large quantity in case youÃ¢â‚¬â„¢re not committed to the color. Paint a piece of foam board and move it around the room to see how the light affects the color at different times of the day.
A good old fashioned, quality paint brush. Get a good quality paint brush and take good care of it. It's a lot less time intensive to use a good brush and make a good line than it is to have to tape it first.
Use a paint comb to clean the bristles of your brush. After cleaning, shake the extra water from your brush and squeeze the excess water from your roller.